System wide jerky scrolling and delay while typing and selecting text

Hi,
I'm new to Mac (first laptop) and I'm noticing just now that the system response feels very low. There's a significant delay when showing characters after typing as well as selecting text, and jerkiness when scrolling anything, from Finder window contents to Safari web pages.
I take care of not installing suspicious software, I use a limited account for daily taks and haven't installed anything lately. Processor usage is as low as ever. Plenty of memory is free (4GB installed) and free disk space is enough (66 GB).
What is happening? Not even Windows behaved like this!
Please help!!!!

I had installed 10.5.8 and it's kind of iffy with file permissions...
The system-wide jerkiness went away with a reboot, but the Safari jerkiness I could attribute to specially heavy surfing I never did before on that day.
I'm accustomed to my Mac working speedy all the time and because of that I can be unforgiving, and it's wrong. I would never complain of jerkiness on my XP PC when opening 30+ browser instances and 100+ tabs in total because I know XP can't handle it, but that was the kind of thing I threw at Safari. And the experienced jerkiness wasn't even on all pages, just a few.

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